alpha: switch handling of 'foreign import wrapper' (FIW) to libffi

I tried to build ghc-6.12.3 and found out FIW part of code
does not compile anymore. It uses absent functions under #ifdef.
Instead of fixing it I just switched to libffi. Result built successfully
and passed 'foreign import wrapper' test I wrote for trac ticket #3516.

I didn't try to build -HEAD yet, but this patch only removes code, so
it should not make -HEAD worse.

2 files changed, 1 insertions, 31 deletions

diff --git a/compiler/typecheck/TcForeign.lhs b/compiler/typecheck/TcForeign.lhs
index 935127c587..330ce57f40 100644
--- a/compiler/typecheck/TcForeign.lhs
+++ b/compiler/typecheck/TcForeign.lhs
@@ -30,10 +30,6 @@ import TcEnv
 import ForeignCall
 import ErrUtils
 import Id
-#if alpha_TARGET_ARCH
-import Type
-import SMRep
-#endif
 import Name
 import TcType
 import DynFlags
@@ -113,7 +109,6 @@ tcCheckFIType sig_ty arg_tys res_ty idecl@(CImport cconv safety _ CWrapper) = do
         [arg1_ty] -> do checkForeignArgs isFFIExternalTy arg1_tys
                         checkForeignRes nonIOok  isFFIExportResultTy res1_ty
                         checkForeignRes mustBeIO isFFIDynResultTy    res_ty
-                        checkFEDArgs arg1_tys
                   where
                      (arg1_tys, res1_ty) = tcSplitFunTys arg1_ty
         _ -> addErrTc (illegalForeignTyErr empty sig_ty)
@@ -178,31 +173,6 @@ checkMissingAmpersand dflags arg_tys res_ty
   = return ()
 \end{code}
 
-On an Alpha, with foreign export dynamic, due to a giant hack when
-building adjustor thunks, we only allow 4 integer arguments with
-foreign export dynamic (i.e., 32 bytes of arguments after padding each
-argument to a quadword, excluding floating-point arguments).
-
-The check is needed for both via-C and native-code routes
-
-\begin{code}
-#include "nativeGen/NCG.h"
-
-checkFEDArgs :: [Type] -> TcM ()
-#if alpha_TARGET_ARCH
-checkFEDArgs arg_tys
-  = check (integral_args <= 32) err
-  where
-    integral_args = sum [ (widthInBytes . argMachRep . primRepToCgRep) prim_rep
-			| prim_rep <- map typePrimRep arg_tys,
-			  primRepHint prim_rep /= FloatHint ]
-    err = ptext (sLit "On Alpha, I can only handle 32 bytes of non-floating-point arguments to foreign export dynamic")
-#else
-checkFEDArgs _ = return ()
-#endif
-\end{code}
-
-
 %************************************************************************
 %*									*
 \subsection{Exports}
diff --git a/mk/config.mk.in b/mk/config.mk.in
index 201ca8878e..be3cbd7186 100644
--- a/mk/config.mk.in
+++ b/mk/config.mk.in
@@ -177,7 +177,7 @@ endif
 # Whether to use libffi for adjustors (foreign import "wrapper") or
 # not.  If we have built-in support (rts/Adjustor.c) then we use that,
 # otherwise we fall back on libffi, which is slightly slower.
-ArchHasAdjustorSupport=$(strip $(if $(findstring $(HostArch_CPP),i386 x86_64 alpha powerpc ia64,),YES,NO))
+ArchHasAdjustorSupport=$(strip $(if $(findstring $(HostArch_CPP),i386 x86_64 powerpc ia64,),YES,NO))
 ifeq "$(ArchHasAdjustorSupport)" "YES"
 UseLibFFIForAdjustors=NO
 else